US PATENT SUBCLASS 266 / 207
.~ By providing, treating or protecting environment, e.g., vacuum


Current as of: June, 1999
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266 /   HD   METALLURGICAL APPARATUS

200  DF  MEANS FOR MELTING OR VAPORIZING METAL OR TREATING LIQUEFIED METAL {19}
207.~ By providing, treating or protecting environment, e.g., vacuum {1}
208  DF  .~.~> By application of vacuum {2}


DEFINITION

Classification: 266/207

(under subclass 200) Device wherein means are provided either for subjecting molten metal to a specific atmosphere or atmospheric condition to bring about a desired physical or chemical change in the metal or for surrounding or blanketing the metal in an inert fluid to prevent contamination of the metal being operated upon.

(1) Note. An example of structure to be found in this and the indented subclasses is vacuum degassing apparatus.